SmogRank / Countries / Portugal / September 2025

Most polluted cities in Portugal, September 2025

4 cities in Portugal ranked by their average PM2.5 over the 30 days. Worst: Paredes at 4.3 µg/m³, #2,249 of 2,439 cities in the world. Cleanest: Faro at 2.5. A city needs measurements on 70% of the days to be ranked.

  1. 1ParedesPorto
    4.3
  2. 2FunchalMadeira
    4.1
  3. 3Ponte de LimaViana do Castelo
    3.2
  4. 4FaroFaro
    2.5
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, September 2025 · Portugal now

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SmogRank, most polluted cities in Portugal, PM2.5, September 2025, smogrank.com/pt/history/2025-09 (accessed 2 Oct 2026).

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